My bench is pretty deep, about 3 ft only because I store my tumbler and ultra sonic cleaner on it. Plus it doubles as a work bench for firearms and car parts. My reloading presses are usually attached at the ends or on a stand alone table for ease of movement and to allow all the components within short reach. The trimmers are all mounted/bolted on planks of wood and c-clamped to the bench when I need them, that way I can move them are store them in cabinets when not in use.